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set_bulk_buffer
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set_bulk_buffer
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bool set_bulk_buffer(u_int32_t sz)
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        <p>Call this function to modify bulk buffer size. </p>
        <p>Bulk retrieval is enabled when creating an iterator, so users later can only modify the bulk buffer size to another value, but can't enable/disable bulk read while an iterator is already alive. </p>
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            <p>The new buffer size in bytes. </p>
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          <p>true if succeeded, false otherwise. </p>
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